<?php

if (! defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package CodeIgniter
 * @author ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license http://codeigniter.com/user_guide/license.html
 * @link http://codeigniter.com
 * @since Version 1.0
 * @filesource
 *
 */
    
// ------------------------------------------------------------------------

/**
 * Parser Class
 *
 * @package CodeIgniter
 * @subpackage Libraries
 * @category Parser
 * @author ExpressionEngine Dev Team
 * @link http://codeigniter.com/user_guide/libraries/parser.html
 */
class CI_Parser
{

    var $l_delim = '{';

    var $r_delim = '}';

    var $object;

    /**
     * Parse a template
     *
     * Parses pseudo-variables contained in the specified template view,
     * replacing them with the data in the second param
     *
     * @access public
     * @param
     *            string
     * @param
     *            array
     * @param
     *            bool
     * @return string
     */
    public function parse ($template, $data, $return = FALSE)
    {
        $CI = & get_instance();
        $template = $CI->load->view($template, $data, TRUE);
        
        return $this->_parse($template, $data, $return);
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Parse a String
     *
     * Parses pseudo-variables contained in the specified string,
     * replacing them with the data in the second param
     *
     * @access public
     * @param
     *            string
     * @param
     *            array
     * @param
     *            bool
     * @return string
     */
    function parse_string ($template, $data, $return = FALSE)
    {
        return $this->_parse($template, $data, $return);
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Parse a template
     *
     * Parses pseudo-variables contained in the specified template,
     * replacing them with the data in the second param
     *
     * @access public
     * @param
     *            string
     * @param
     *            array
     * @param
     *            bool
     * @return string
     */
    function _parse ($template, $data, $return = FALSE)
    {
        if ($template == '') {
            return FALSE;
        }
        
        foreach ($data as $key => $val) {
            if (is_array($val)) {
                $template = $this->_parse_pair($key, $val, $template);
            } else {
                $template = $this->_parse_single($key, (string) $val, $template);
            }
        }
        
        if ($return == FALSE) {
            $CI = & get_instance();
            $CI->output->append_output($template);
        }
        
        return $template;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Set the left/right variable delimiters
     *
     * @access public
     * @param
     *            string
     * @param
     *            string
     * @return void
     */
    function set_delimiters ($l = '{', $r = '}')
    {
        $this->l_delim = $l;
        $this->r_delim = $r;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Parse a single key/value
     *
     * @access private
     * @param
     *            string
     * @param
     *            string
     * @param
     *            string
     * @return string
     */
    function _parse_single ($key, $val, $string)
    {
        return str_replace($this->l_delim . $key . $this->r_delim, $val, 
                $string);
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Parse a tag pair
     *
     * Parses tag pairs: {some_tag} string... {/some_tag}
     *
     * @access private
     * @param
     *            string
     * @param
     *            array
     * @param
     *            string
     * @return string
     */
    function _parse_pair ($variable, $data, $string)
    {
        if (FALSE === ($match = $this->_match_pair($string, $variable))) {
            return $string;
        }
        
        $str = '';
        foreach ($data as $row) {
            $temp = $match['1'];
            foreach ($row as $key => $val) {
                if (! is_array($val)) {
                    $temp = $this->_parse_single($key, $val, $temp);
                } else {
                    $temp = $this->_parse_pair($key, $val, $temp);
                }
            }
            
            $str .= $temp;
        }
        
        return str_replace($match['0'], $str, $string);
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Matches a variable pair
     *
     * @access private
     * @param
     *            string
     * @param
     *            string
     * @return mixed
     */
    function _match_pair ($string, $variable)
    {
        if (! preg_match(
                "|" . preg_quote($this->l_delim) . $variable .
                         preg_quote($this->r_delim) . "(.+?)" .
                         preg_quote($this->l_delim) . '/' . $variable .
                         preg_quote($this->r_delim) . "|s", $string, $match)) {
            return FALSE;
        }
        
        return $match;
    }
}
// END Parser Class

/* End of file Parser.php */
/* Location: ./system/libraries/Parser.php */
